Automating code styling

[tygamvrelis]

Describe the feature
Automate the task of making sure code is styled consistently.

Reason for request
Despite people's best intentions and the fact that we have a coding style, it is still easy for little things to accidentally slip past a developer and/or reviewer's eyes (e.g. tabs vs spaces). Automating this task would lessen the burden on developers and would improve code consistency.

Timeline
Not urgent.

Additional information
Astyle seems to be a popular choice for automatic code styling, and it looks like it can be incorporated into makefiles easily.

[tygamvrelis]

Update: seems like clang-format is another popular choice